How to get image as a resource instead of string in php using Storage::get()

I am trying to give user the photo with desired background that are stored in my server with the text they want on it. But to edit the image, i need it as resource but i get the image as string instead.

I tried using Storage::get() function

$bg_image = Storage::disk('public')->get('background.png');
imagettftext($bg_image, 64, 10, 20, 20, $color, $font, $user_name);

but it threw me an error imagettftext() expects parameter 1 to be resource, string given

via Chebli Mohamed